A card reader includes a stopper or wall at the back of an insertion passage where a card is inserted. If a breakage of the wall at the back of the insertion passage is detected, the card processor drives the shutter to block the insertion port. This reliably prevents such an occurrence that the customer...http://www.google.es/patents/US6834809?utm_source=gb-gplus-sharePatente US6834809 - Card processor
